Laser powder bed fusion of Zr-modified Al-Cu-Mg alloy:Processability and elevated-temperature mechanical properties  

作　　者：Yanfang Wang Xin Lin Yufan Zhao Zihong Wang Xiaobin Yu Xuehao Gao Weidong Huang 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China [2]Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design,MIIT China,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Journal of Materials Science & Technology》2023年第5期223-235,共13页材料科学技术（英文版）

基　　金：The work was financially supported by the National Key R&D Program of China(No.2016YFB1100100);the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(No.2020-TZ-02);the Advance Research Projects in the Field of Manned Spaceflight(No.040302);the Shanghai Aerospace Science and Technology Innovation Fund Project(No.SAST2018-066);This work was also supported by the“Fundamental Research Funds for the Central Universities”(No.G2021KY05104);the“Natural Science Basis Research Plan in Shaanxi Province of China”(No.2022JQ-479).We would like to thank Editage(www.editage.com)for En-glish language editing.

摘　　要：Zr modification is an effective method for improving hot-cracking resistance and elevated-temperature mechanical properties during laser powder bed fusion(L-PBF)of traditional medium and high strength wrought aluminum alloys.This study investigated the l-PBF processability and elevated-temperature mechanical properties of a Zr-modified 2024Al alloy.It was found that the hot-cracking susceptibility increased with the increased scanning speed,which was in reasonable agreement with the modified Rappaz-Drezet-Gremaud criterion.Furthermore,the primary L1_(2)-Al_(3)Zr precipitates,which acted as ef-ficient nucleation sites,precipitated at the fusion boundary of the melt pool,leading to the formation of a heterogeneous grain structure.The yield strength(YS)of the as-fabricated samples at 150,250,and 350℃was 363,210,and 48 MPa,respectively.Despite the slight decrease to 360 MPa of the YS when tested at 150℃,owing to the additional precipitate strengthening from the L1_(2)-Al_(3)Zr precipitates,the YS achieved yield strengths of 253 and 69 MPa,an increase of 20.5%and 30.4%,when tested at 250 and 350℃,respectively.The yield strengths in both the as-fabricated and T6-treated conditions tested at 150 and 250℃were comparable to those of casting Al-Cu-Mg-Ag alloys and superior to those of traditionally heat-resistant 2219-T6 and 2618-T6 of Al-Cu alloys.

关 键 词：Laser powder bed fusion ZIRCONIUM Al-Cu-Mg alloy PROCESSABILITY Elevated-temperature mechanical property 

分 类 号：TG156[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]